Another thing that people are missing is that a net zero change, or even a small loss would be worth it in terms of freedom. You're no longer compelled to stay at your current job just to keep your healthcare, and if you lose your job then you only have one problem rather than two -- especially in the middle of a pandemic, when lots of people are getting laid off and needing to go to the hospital due to covid
HN and VCs ought to be extremely interested in single-payer for this reason. Healthcare (for themselves and their families) is a big reason why, in practice, people stick around at stable employers.
Also, private stock valuation can't simply pay health insurance bills.
I certainly couldn't ever seriously consider early stage startups, as my spouse is unfortunately heavily dependent on my healthcare. It'd be cool if that was no longer a blocker.